See Bk. VII. chap. 25, where Eusebius quotes a lengthy discussion of the Apocalypse by Dionysius of Alexandria. He also cites opinions favorable to the authenticity of the Apocalypse from Justin (in IV. 18, below), Theophilus (IV. 24), Irenæus (V. 8), and Origen (VI. 25), but such scattered testimonies can hardly be regarded as the fulfillment of the definite promise which he makes in this passage.